fix

tg_parser/internal/adapter/database/update_channel.go

@@ -3,6 +3,7 @@ package database
 import (
 	"context"
 	"fmt"
+	"strings"
 
 	"github.com/jackc/pgx/v5/pgtype"
 
@@ -22,10 +23,13 @@ WHERE id = $1;`
 
 	txOrPool := transaction.TryExtractTX(ctx)
 
+	username := strings.TrimSpace(channel.Username)
+	usernameValid := username != ""
+
 	dto := updateChannelDTO{
 		ID:         pgtype.UUID{Bytes: channel.ID, Valid: true},
 		TelegramID: pgtype.Int8{Int64: channel.TelegramID, Valid: true},
-		Username:   pgtype.Text{String: channel.Username, Valid: true},
+		Username:   pgtype.Text{String: username, Valid: usernameValid},
 		Title:      pgtype.Text{String: channel.Title, Valid: true},
 		AccessHash: pgtype.Int8{Int64: channel.AccessHash, Valid: true},
 		Pts:        pgtype.Int4{Int32: int32(channel.Pts), Valid: true},